SIO1007 Datasheet, PDF (18/108 Pages) Microchip Technology – LPC Super I/O LPC IrDA Hot Docking Chip with UART

SIO1007
8.0 LPC PORTSWITCH
The SIO1007 PortswitchInterface provides a hot-switchable Docking LPC interface available to an external Super
I/O device contained within a docking station. The Docking LPC bus signals, when enabled, will be routed through low
impedance (10), bi-directional switches contained in the SIO1007. The SIO1007 controls the enabling of the LPC
docking interface. When the SIO1007 LPC Docking interface is enabled, the SIO1007 autonomously blocks all trusted
LPC cycles while forwarding all standard LPC cycles to the LPC Docking interface.
A switchable PCICLK is available to be supplied to an external devices contained within a docking station. The SIO1007
Docking PCICLK output is a low skewed switched version of the input. which, when enabled, is routed through low
impedance (10), bi-directional switch contained in the SIO1007. The SIO1007 controls the enabling of the Docking
PCICLK output.
A switchable 14.318MHz clock is available to external devices contained within a docking station. The SIO1007 Docking
14.318MHz clock output is a buffered version of the input. The SIO1007 controls the enabling of the Docking 14MHz
clock output.
See Figure 8-1.for an illustration of a System level docking solution using the LPC PortSwitchInterface.
FIGURE 8-1:
DOCKING SOLUTION USING THE LPC PORTSWTICH INTERFACE
Notebook
SIO_14M
14MHz
14Mhz ^Buffer
Clock
ENB
33MHz
Driver _{PCICLK Switch}
LPC_CLK_33
LPC
Docking
System
Switch
LPC
Master
LPC BUS
Control
Register
(LAD{3:0], LFRAME#,
LDRQ0#, LDRQ1#,
LPC Host
SERIRQ, CLKRUN#,
LRESET#)
Primary Super I/O
Notebook
Ports
Docking Station
Docking
Connector
DSIO_14M
DLPC_CLK_33
SWITCHED
LPC BUS
(DLAD[3:0],
DLFRAME#,
DLDRQ1#,
DSERIRQ,
DCLKRUN#)
LPC
Peripheral
Docking Super I/O
Dock
Ports
8.1 LPC PortSwitch Interface
The signals to be switched in the LPC PortSwitch interface are shown in Table 8-1. All signals except SIO_14M and
DSIO_14M are 3.3V only. SIO_14M and DSIO_14M are 5 Volt tolerant.
DS00002020A-page 18
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